Swirl water in a cup, and the water will move to the outer edge of the cup. Sometimes, when you swirl hard enough, it will actually start "climbing" the walls of the cup, as the water collects at the outer edge. Now take a cup of tea with a few tea leaves in it and stir it with a spoon. The tea leaves collect in… »5/06/14 6:40am 5/06/14 6:40am